I received the seal this Friday and did the install on my October built Rebel.
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Like others have noted, the seal is centered on the cab/bed. I made the mistake of starting with the outermost hole and could not get the rest to lineup. Eventually I was able to remove the seal and started with the second outermost hole I could find and the rest of the seal went in rather easily. Here are before and after pictures from the bed of the truck (kind of tough to take good pictures)
Before (without the seal):
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After (with the seal installed):
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As for noise isolation, I could tell the difference under 45MPH. I would say the difference from the driver seat without the seal in place was like driving with a rear window slightly open. Now with the seal in place, it drives as if the same rear window has been closed. However, I did a before and after test at 50MPH on the same stretch of roadway, and could not get a measurable difference in my sound decibel reader application.
I attribute this to the fact that I have the stock wrangler duratrac tires. I think the tire whine produced by the tires overcomes any speed related wind noise at 50MPH that may have been present without the seal installation. Just a thought. Or it could be that the sound meter app I have is not very accurate.
I wonder if someone with duratrac tires experiences the same low speed noise isolation improvement with the seal installed, but negligible noise isolation at highway speeds because of the tire whine?